In this work, free tall oil fatty acids were epoxidized with in-situ generated peroxyacetic acid. Reaction kineticsof epoxidation was investigated by oxirane content and iodine value titrimetric determination, as well...In this work, free tall oil fatty acids were epoxidized with in-situ generated peroxyacetic acid. Reaction kineticsof epoxidation was investigated by oxirane content and iodine value titrimetric determination, as well as FTIRspectra analysis. A highly functional biobased polyol was synthesized by functionalizing epoxidized tall oilfatty acids with triethanolamine using Montmorillonite K10 as a catalyst. The obtained polyol was analyzed byFTIR and MALDI-TOF MS. The most common chemical and physical characteristics of obtained polyol weredetermined.展开更多
It is crucial to adapt the processing of forest bio-resources into biochemicals and bio-based ad-vanced materials in order to transform the current economic climate into a greener economy.Tall oil,as a by-product of t...It is crucial to adapt the processing of forest bio-resources into biochemicals and bio-based ad-vanced materials in order to transform the current economic climate into a greener economy.Tall oil,as a by-product of the Kraft process of wood pulp manufacture,is a promising resource for the extraction of various value-added products.Tall oil fatty acids-based multifunctional Michael acceptor acrylates were developed.The suitability of developed acrylates for polymerization with tall oil fatty acids-based Michael donor acetoacetates to form a highly cross-linked polymer ma-terial via the Michael addition was investigated.With this novel strategy,valuable chemicals and innovative polymer materials can be produced from tall oil in an entirely new way,making a significant contribution to the development of a forest-based bioeconomy.Two different tall oil-based acrylates were successfully synthesized and characterized.Synthesized acrylates were successfully used in the synthesis of bio-based thermoset polymers.Obtained polymers had a wide variety of mechanical and thermal properties(glass transition temperature from-12.1 to 29.6°C by dynamic mechanical analysis,Young’s modulus from 15 to 1760 MPa,and stress at break from 0.9 to 16.1 MPa).Gel permeation chromatography,Fourier-transform infrared(FT-IR)spectroscopy,matrix-assisted laser desorption/ionization-time of flight mass spectrometry,and nuclear magnetic resonance were used to analyse the chemical structure of synthesized acrylates.In addition,various titration methods and rheology tests were applied to characterize acrylates.The chemical composition and thermal and mechanical properties of the developed polymers were studied by using FT-IR,solid-state nuclear magnetic resonance,thermal gravimetric analy-sis,differential scanning calorimetry,dynamic mechanical analysis,and universal strength testing apparatus.展开更多
文摘In this work, free tall oil fatty acids were epoxidized with in-situ generated peroxyacetic acid. Reaction kineticsof epoxidation was investigated by oxirane content and iodine value titrimetric determination, as well as FTIRspectra analysis. A highly functional biobased polyol was synthesized by functionalizing epoxidized tall oilfatty acids with triethanolamine using Montmorillonite K10 as a catalyst. The obtained polyol was analyzed byFTIR and MALDI-TOF MS. The most common chemical and physical characteristics of obtained polyol weredetermined.
基金funded by the Latvian Council of Science,project“High bio-based content thermoset polymer foam development from plant origin oils (Bio-Mer)” (No.lzp-2020/1-0385)supported by ESF within Project"Strengthening of PhD students and academic personnel of Riga Technical University and BA School of Business and Finance in the strategic fields of specialization" (No 8.2.2.0/20/I/008)of the Specific Objective 8.2.2"To Strengthen Academic Staffof Higher Education Institutions in Strategic Specialization Areas"of the Operational Programme"Growth and Employment”supported by Riga Technical University’s Doctoral Grant programme.
文摘It is crucial to adapt the processing of forest bio-resources into biochemicals and bio-based ad-vanced materials in order to transform the current economic climate into a greener economy.Tall oil,as a by-product of the Kraft process of wood pulp manufacture,is a promising resource for the extraction of various value-added products.Tall oil fatty acids-based multifunctional Michael acceptor acrylates were developed.The suitability of developed acrylates for polymerization with tall oil fatty acids-based Michael donor acetoacetates to form a highly cross-linked polymer ma-terial via the Michael addition was investigated.With this novel strategy,valuable chemicals and innovative polymer materials can be produced from tall oil in an entirely new way,making a significant contribution to the development of a forest-based bioeconomy.Two different tall oil-based acrylates were successfully synthesized and characterized.Synthesized acrylates were successfully used in the synthesis of bio-based thermoset polymers.Obtained polymers had a wide variety of mechanical and thermal properties(glass transition temperature from-12.1 to 29.6°C by dynamic mechanical analysis,Young’s modulus from 15 to 1760 MPa,and stress at break from 0.9 to 16.1 MPa).Gel permeation chromatography,Fourier-transform infrared(FT-IR)spectroscopy,matrix-assisted laser desorption/ionization-time of flight mass spectrometry,and nuclear magnetic resonance were used to analyse the chemical structure of synthesized acrylates.In addition,various titration methods and rheology tests were applied to characterize acrylates.The chemical composition and thermal and mechanical properties of the developed polymers were studied by using FT-IR,solid-state nuclear magnetic resonance,thermal gravimetric analy-sis,differential scanning calorimetry,dynamic mechanical analysis,and universal strength testing apparatus.
